TWI676075B - Projector, illumination system, and diffuser element - Google Patents

Abstract

A projector includes an illumination system, a light valve, and a lens. The lighting system is adapted to provide a lighting beam and includes a light source and a diffusing element. The light source is adapted to provide an excitation beam. The diffusing element is located on a transmission path of at least part of the excitation light beam, and is adapted to receive at least part of the excitation light beam to output at least part of the illumination light beam. The diffusion element includes at least a first diffusion region and at least a second diffusion region. The second diffusion region surrounds the first diffusion region. The haze of the first diffusion region is greater than the haze of the second diffusion region. The light valve is located on the transmission path of the illumination beam from the lighting system, and is suitable for converting the illumination beam from the illumination system into an image beam. The lens is located on the transmission path of the image beam.

Description

Projector, lighting system and diffuser

The present invention relates to an optical device and its components, and more particularly to a projector, an illumination system, and a diffusing element.

The projector is a display device for generating a large-sized picture. The imaging principle of the projector is to convert the illumination beam generated by the light source into an image beam through a light valve, and then project the image beam onto a screen or wall through a lens.

Generally speaking, the diffuser element in the projector atomizes the laser beam emitted by the laser light source. Its main purpose is to eliminate the central spot of the laser beam and prevent the laser beam energy from being excessively concentrated, so as to avoid subsequent fluorescent wheels. The center of the fluorescent glue or other components will burn out or deteriorate, thereby improving the reliability of the projector. However, if the haze of the diffusing element is too high, it will reduce its light transmittance and fail to provide sufficient light intensity at the non-center of the laser beam, thereby affecting the light utilization efficiency of the projector. Therefore, how to effectively eliminate the central spot of the laser beam while providing sufficient light intensity at the non-center of the laser beam is an important issue in the design of the diffusing element.

The "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" paragraph may include some conventional technologies that do not constitute the ordinary knowledge of those skilled in the art. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a projector, a lighting system and a diffusing element, which can provide sufficient light intensity while preventing the energy of the excitation beam from being excessively concentrated.

The invention provides a projector, an illumination system and a diffusing element, which can improve the diffusion effect of a light beam and reduce the manufacturing cost.

Other objects and advantages of the present invention can be further understood from the technical features disclosed by the present invention.

In order to achieve one or a part or all of the foregoing or other objectives, an embodiment of the present invention provides a projector including an illumination system, a light valve, and a lens. The lighting system is adapted to provide a lighting beam and includes a light source and a diffusing element. The light source is adapted to provide an excitation beam. The diffusing element is located on a transmission path of at least part of the excitation light beam, and is adapted to receive at least part of the excitation light beam to output at least part of the illumination light beam. The diffusion element includes at least a first diffusion region and at least a second diffusion region. The at least one second diffusion region surrounds the at least one first diffusion region. The haze of the at least one first diffusion region is greater than the at least one second diffusion region. Haze. The light valve is located on the transmission path of the illumination beam from the lighting system, and is suitable for converting the illumination beam from the illumination system into an image beam. The lens is located on the transmission path of the image beam.

In order to achieve one or a part or all of the foregoing or other objectives, an embodiment of the present invention provides a lighting system including a light source and a diffusing element. The light source is adapted to provide an excitation beam. The diffusion element is located on at least a part of the transmission path of the excitation beam. The diffusion element includes at least one first diffusion region and at least one second diffusion region. The at least one second diffusion region surrounds the at least one first diffusion region. The haze of the at least one first diffusion region is greater than the haze of the at least one second diffusion region. .

In an embodiment of the present invention, an optical axis of the illumination light beam passes through at least one first diffusion region.

In order to achieve one or some or all of the above or other objectives, an embodiment of the present invention provides a diffusion element including at least a first diffusion region and at least a second diffusion region. The at least one second diffusion region surrounds the at least one first diffusion region, and the haze of the at least one first diffusion region is greater than the haze of the at least one second diffusion region.

In an embodiment of the present invention, the above-mentioned diffusion element has opposite light incident surfaces and light emitting surfaces, at least one first diffusion region includes two first diffusion regions, and at least one second diffusion region includes two second diffusion regions The two first diffusion regions are respectively located on the light incident surface and the light exit surface and are aligned with each other, and the two second diffusion regions are respectively located on the light incident surface and the light exit surface and are aligned with each other.

In an embodiment of the present invention, the haze of the above-mentioned diffusion element gradually decreases from at least one first diffusion region to at least one second diffusion region.

In an embodiment of the present invention, the at least one first diffusion region has a plurality of first diffusion structures, and the at least one second diffusion region has a plurality of second diffusion structures. The arrangement density of the first diffusion structures is greater than that of the first diffusion structures. Arrangement density of two diffusion structures.

In an embodiment of the present invention, the at least one first diffusion region has a plurality of first diffusion structures, and the at least one second diffusion region has a plurality of second diffusion structures. The size of each first diffusion structure is smaller than that of each. The size of the second diffusion structure.

In one embodiment of the present invention, the above-mentioned diffusion element is a fixed type diffusion sheet.

In an embodiment of the present invention, the diffusion element is a diffusion wheel and is suitable for rotation.

In order to achieve one or a part or all of the foregoing or other objectives, an embodiment of the present invention provides another projector, including an illumination system, a light valve, and a lens. The lighting system is adapted to provide a lighting beam and includes a light source and a diffusing element. The light source is adapted to provide an excitation beam. The diffusing element is located on at least a part of the excitation light beam transmission path, and is adapted to receive at least a part of the excitation light beam to output at least a part of the illumination light beam. These diffusion structures located on the light incident surface and the light emitting surface are uniformly distributed. The light valve is located on the transmission path of the illumination beam from the lighting system, and is suitable for converting the illumination beam from the illumination system into an image beam. The lens is located on the transmission path of the image beam.

In order to achieve one or some or all of the above or other purposes, an embodiment of the present invention provides another lighting system, including a light source and a diffusing element. The light source is adapted to provide an excitation beam. The diffusing element is located on at least a part of the transmission path of the excitation light beam, and has a plurality of diffusing structures and opposite light incident and light emitting surfaces. These diffusion structures located on the light incident surface and the light emitting surface are uniformly distributed.

In order to achieve one or a part or all of the foregoing or other objectives, an embodiment of the present invention provides another diffusing element, including a plurality of diffusing structures, a light incident surface, and a light emitting surface. The light exit surface is opposite to the light entrance surface. These diffusion structures located on the light incident surface and the light emitting surface are uniformly distributed.

Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiment of the present invention, the diffusion element can be divided into a first diffusion region and a second diffusion region surrounding the first diffusion region, and the haze of the first diffusion region is greater than the haze of the second diffusion region, that is, the diffusion element can There are multiple diffusion areas with different degrees of atomization. In this way, the high haze of the first diffusion region can be used to effectively eliminate the central spot of the excitation beam and the energy of the excitation beam is not excessively concentrated, and the low haze of the second diffusion region can be used to provide the non-center of the excitation beam. Sufficient light intensity makes the projector have good brightness, reliability and light utilization. In the embodiment of the present invention, both the light incident surface and the light emitting surface of the diffusing element may have a plurality of diffusion structures with a uniform distribution. Thereby, the diffusion effect of the light beam can be improved and the manufacturing cost can be reduced.

In order to make the above features and advantages of the present invention more comprehensible, embodiments are hereinafter described in detail with reference to the accompanying drawings.

The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front, or rear, are only directions referring to the attached drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

FIG. 1 is a schematic diagram of a projector according to an embodiment of the invention. Please refer to FIG. 1, the projector 100 in this embodiment includes an illumination system 110, a light valve 120 and a lens 130. The lighting system 110 is adapted to provide an illumination light beam L2. The light valve 120 is located on a transmission path of the illumination light beam L2 from the illumination system 110 and is adapted to convert the illumination light beam L2 from the illumination system 110 into an image beam L3. The lens 130 is located on a transmission path of the image light beam L3 and is suitable for projecting the image light beam L3 outside the projector 100. The light valve 120 may include a digital micro-mirror device (DMD), a Liquid Crystal on Silicon (LCoS), or a liquid crystal display panel (Liquid Crystal Display Panel, LCD panel), but is not limited thereto.

In this embodiment, the lighting system 110 includes a light source 112 and a diffusion element 114. The light source 112 is, for example, a laser light source and is suitable for providing the excitation light beam L1, but is not limited thereto. In other embodiments, the light source 112 may also be a light emitting diode light source, but is not limited thereto. The diffusion element 114 is located on a transmission path of at least part of the excitation light beam L1 and is adapted to receive at least part of the excitation light beam L1 to output at least part of the illumination light beam L2. In detail, in one embodiment, the diffusing element 114 can be applied to a projector without a phosphor wheel. The illumination beam L2 is diffused by the diffusing element 114 and can be eliminated by the excitation beam L1 excited by the phosphor wheel. form. In addition, in another embodiment, the diffusing element 114 can be applied to a projector having a fluorescent wheel, a part of the excitation beam L1 can be diffused by the diffusing element 114 to become a part of the illumination beam L2, and the wavelength of the other part of the excitation beam L1 It can be wavelength-converted by the fluorescent wheel to become another part of the illumination beam L2.

FIG. 2 is a front view of the diffusion element of FIG. 1. FIG. Please refer to FIG. 2. The diffusion element 114 in this embodiment is, for example, a diffuser wheel and is adapted to rotate, so as to prevent the excitation beam L1 from continuously irradiating a single region of the diffusion element 114 and overheating this region. The diffusion element 114 includes a first diffusion region 114a and a second diffusion region 114b. The second diffusion region 114b surrounds the first diffusion region 114a. The optical axis of the illumination beam L2 (shown in FIG. 1) passes through the first diffusion region 114a, and the first The haze of one diffusion region 114a is greater than the haze of the second diffusion region 114b. For example, in one embodiment, the haze of the first diffusion region 114a is, for example, 20-30, and the diffusion angle of the first diffusion region 114a is about 2.2 degrees. In one embodiment, the haze of the second diffusion region 114b is, for example, 10-20, and the diffusion angle of the second diffusion region 114b is about 1.8 degrees.

The diffusion element 114 is divided into the first diffusion region 114a and the second diffusion region 114b surrounding the first diffusion region 114a as described above. The haze of the first diffusion region 114a is greater than the haze of the second diffusion region 114b. The first diffusion region 114a corresponds to the center of the excitation light beam L1, so the central spot of the excitation light beam L1 can be effectively eliminated and the energy of the excitation light beam L1 is not excessively concentrated. The second diffusion region 114b can thus provide sufficient light intensity. In this way, the projection image provided by the projector 100 can have good light uniformity, reliability, and light utilization efficiency.

FIG. 3 is a partially enlarged view of the diffusion element of FIG. 2. Referring to FIG. 3, in this embodiment, the first diffusion region 114a has a plurality of first diffusion structures 114a1, and the second diffusion region 114b has a plurality of second diffusion structures 114b1. In this embodiment, the arrangement density of the first diffusion structures 114a1 is greater than the arrangement density of the second diffusion structures 114b1, so that the haze of the first diffusion region 114a is greater than the haze of the second diffusion region 114b. In an embodiment, the size of each first diffusion structure 114a1 is smaller than the size of each second diffusion structure 114b1, for example, the haze of the first diffusion region 114a may be greater than the haze of the second diffusion region 114b. Limited to this.

FIG. 4 is a side view of the diffusion element of FIG. 1. Please refer to FIG. 4. In this embodiment, the diffusion element 114 has a light incident surface 114 c, and the first diffusion region 114 a and the second diffusion region 114 b are both located on the light incident surface 114 c. However, the present invention is not limited to this, which is exemplified below with reference to the drawings. FIG. 5 is a side view of a diffusion element according to another embodiment of the present invention. The embodiment shown in FIG. 5 is different from the embodiment shown in FIG. 4 mainly in that the diffusing element 114 has opposite light incident surfaces 114c and light emitting surfaces 114d, two first diffusion regions 114a-in and first diffusion regions 114a- Out is located on the light incident surface 114c and the light emitting surface 114d and is aligned with each other. The two second diffusion regions 114b-in and the second diffusion region 114b-out of the inner circle are located on the light incident surface 114c and the light emitting surface 114d and are aligned with each other. The two second diffusion regions 114b-in and the second diffusion region 114b-out of the outer ring are respectively located on the light incident surface 114c and the light exit surface 114d and are aligned with each other. Therefore, even if the excitation light beam L1 (shown in FIG. 1) is not effectively atomized on the light incident surface 114 c due to the junction of the adjacent diffusion structure incident on the light incident surface 114 c, it will still pass through the light emitting surface 114 d. The diffusion structure is effectively atomized. In short, a first diffusion region (114a-in / 114a-out) and a second diffusion region (114b-in / 114b-out) are provided on the light incident surface 114c and the light exit surface 114d to form a double-sided atomized diffusion. Element 114, which helps to improve the diffusion effect of the light beam. In addition, in an embodiment, the thickness of the first diffusion region 114a-in / 114a-out in FIG. 5 is, for example, smaller than the thickness of the first diffusion region 114a in FIG. 4, and the second diffusion region 114b-in / 114b- The thickness of out is, for example, smaller than the thickness of the second diffusion region 114 b in FIG. 4, but is not limited thereto. In one embodiment, by reducing the thickness of the first diffusion region 114a-in / 114a-out and the thickness of the second diffusion region 114b-in / 114b-out, the process cost can be reduced. In addition, in other embodiments not shown, the diffusion structure on the light incident surface of the double-sided atomized diffusion element is uniformly distributed, so the haze value is, for example, a constant value. The light-emitting surface of the double-sided atomized diffusion element is, for example, uniform. The diffusion structure on the surface is, for example, uniformly distributed, so the haze value is, for example, a constant value, that is, the haze value of the first diffusion region 114a-in (or 114a-out) in the double-sided atomized diffusion element of other embodiments is equal to the second value. Haze value of the diffusion region 114b-in (or 114b-out); from another perspective, the double-sided atomization diffusion element in other embodiments may not be divided into the first diffusion region and the second diffusion in the above embodiment. Area. In some embodiments, the haze value of the diffusion structure with a uniform distribution on the light incident surface of the double-sided atomized diffusion element and the haze value of the diffusion structure with a uniform distribution on the light exit surface are, for example, the same or different. Overall, the double-sided atomized diffusion element can achieve the effects of improving light transmittance, accuracy of the degree of light atomization (light diffusion angle), and uniformity of the light diffusion angle. In the embodiment of FIG. 4 described above, the diffusion element 114 may be a transmission-type diffusion wheel or a reflection-type diffusion wheel. In the embodiments shown in FIG. 4 and FIG. 5, the driving device (for example, a motor) for driving the diffusion element 114 is, for example, located opposite to the light incident surface 114c or the light exit surface 114d, but is not limited thereto.

FIG. 6 is a front view of a diffusion element according to another embodiment of the present invention. In the diffusion element 214 shown in FIG. 6, the second diffusion region 214b surrounds the first diffusion region 214a. However, since the configuration and function of the first diffusion region 214a and the second diffusion region 214b are similar to the configuration and function of the first diffusion region 114a and the second diffusion region 114b shown in FIG. 2, they are not repeated here. The difference between the diffusion element 214 and the diffusion element 114 is mainly that the diffusion element 214 in FIG. 6 is a fixed diffusion sheet, which is different from the diffusion element 114 in FIG. 2 as a diffusion wheel. That is, the diffusion element 214 in FIG. 6 is used as a static diffusion sheet, and the diffusion element 114 in FIG. 2 is used as a dynamic diffusion wheel. In this embodiment, the first diffusion structure in the first diffusion region 214a is uniformly distributed, and thus the haze value of the first diffusion region 214a is, for example, a constant value. The second diffusion structure in the second diffusion region 214b, for example, is uniformly distributed. The haze value of the second diffusion region 214b is, for example, a constant value, but is not limited thereto. In addition, in other embodiments not shown, the above-mentioned two-sided atomized diffusion element may also be a fixed (static) diffusion sheet.

FIG. 7 is a front view of a diffusion element according to another embodiment of the present invention. In the diffusion element 314 shown in FIG. 7, the arrangement and operation of the first diffusion region 314 a and the second diffusion region 314 b are similar to the arrangement and operation of the first diffusion region 214 a and the second diffusion region 214 b shown in FIG. 6. , I will not repeat them here. The difference between the diffusion element 314 and the diffusion element 214 is that the haze of the diffusion element 314 gradually decreases from the first diffusion region 314a to the second diffusion region 314b. In this embodiment, for example, the haze of the first diffusion region 314a gradually decreases from the center of the first diffusion region 314a to the second diffusion region 314b, and the haze of the second diffusion region 314b is, for example, from the periphery of the first diffusion region 314a to the first. The periphery of the second diffusion region 314b gradually decreases. However, in other embodiments, the first diffusion region 314a and the second diffusion region 314b whose haze gradually decreases from the center to the periphery in FIG. 7 can also be applied to a dynamic diffusion wheel.

FIG. 8 is a front view of a diffusion element according to another embodiment of the present invention. In the diffusion element 414 shown in FIG. 8, the arrangement and function of the first diffusion region 414 a and the second diffusion region 414 b are similar to the arrangement and function of the first diffusion region 114 a and the second diffusion region 114 b shown in FIG. 2. , I will not repeat them here. The difference between the diffusing element 414 and the diffusing element 114 is mainly that the diffusing element 414 is a rotating wheel integrating a diffusing wheel and a fluorescent wheel, and includes a phosphor powder region P, a first diffusion region 414a, and a second diffusion region 414b. Diffusion zone. With the rotation of the rotating wheel, the phosphor region P and the diffusion region (the first diffusion region 414a and the second diffusion region 414b) can be sequentially moved to the transmission path of the excitation beam L1 (shown in FIG. 1). .

In the above embodiments, the diffusion structure in the diffusion element may be manufactured by etching, sandblasting, grinding, or other atomizing methods with an appropriate jig, but is not limited thereto.

In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiment of the present invention, the diffusion element can be divided into a first diffusion region and a second diffusion region surrounding the first diffusion region, and the haze of the first diffusion region is greater than the haze of the second diffusion region, that is, the diffusion element can There are multiple diffusion areas with different degrees of atomization. In this way, the high haze of the first diffusion region can be used to effectively eliminate the central spot of the excitation beam and the energy of the excitation beam is not excessively concentrated, and the low haze of the second diffusion region can be used to provide the non-center of the excitation beam. Sufficient light intensity makes the projector have good brightness, reliability and light utilization. In the embodiment of the present invention, both the light incident surface and the light emitting surface of the diffusing element may have a plurality of diffusion structures with a uniform distribution. Thereby, the diffusion effect of the light beam can be improved and the manufacturing cost can be reduced. Generally speaking, the embodiments of the present invention can improve the optical-mechanical design flexibility of the projector. In an embodiment of the present invention, when the diffusion element of the embodiment of the present invention is applied to a projector having a fluorescent wheel and a filter wheel, a diffusion element (a dynamic diffusion wheel or a static diffusion can also be improved). Sheet), fluorescent wheel and filter wheel design flexibility, thereby improving the light diffusion / light conversion / filtering efficiency of the diffusive element (dynamic diffusion wheel or static diffusion sheet), fluorescent wheel and filter wheel.

However, the above are only the preferred embodiments of the present invention. When the scope of implementation of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made according to the scope of the patent application and the description of the invention, All are still within the scope of the invention patent. In addition, any embodiment of the present invention or the scope of patent application does not need to achieve all the purposes or advantages or features disclosed by the invention. In addition, the abstract and the title are only used to assist the search of patent documents, and are not intended to limit the scope of rights of the present invention. In addition, the terms "first" and "second" mentioned in this specification or the scope of the patent application are only used to name the elements or to distinguish different embodiments or ranges, but not to limit the number of elements. Upper or lower limit.

100‧‧‧ Projector

110‧‧‧lighting system

112‧‧‧light source

114, 214, 314, 414 ...

114a, 214a, 314a, 414a

114a1‧‧‧First diffusion structure

114b, 214b, 314b, 414b ‧‧‧ Second diffusion zone

114b1‧‧‧Second diffusion structure

114c‧‧‧Into the smooth surface

114d‧‧‧light surface

120‧‧‧light valve

130‧‧‧ lens

L1‧‧‧ Excitation beam

L2‧‧‧illuminating beam

L3‧‧‧Image Beam

P‧‧‧Fluorescent powder area

FIG. 1 is a schematic diagram of a projector according to an embodiment of the invention. FIG. 2 is a front view of the diffusion element of FIG. 1. FIG. FIG. 3 is a partially enlarged view of the diffusion element of FIG. 2. FIG. 4 is a side view of the diffusion element of FIG. 1. FIG. 5 is a side view of a diffusion element according to another embodiment of the present invention. FIG. 6 is a front view of a diffusion element according to another embodiment of the present invention. FIG. 7 is a front view of a diffusion element according to another embodiment of the present invention. FIG. 8 is a front view of a diffusion element according to another embodiment of the present invention.

Claims (26)

A projector includes: an illumination system adapted to provide an illumination beam, and comprising: a light source adapted to provide an excitation beam; and a diffusing element located on at least a part of the transmission path of the excitation beam, and Receiving at least a portion of the excitation beam to output at least a portion of the illumination beam, wherein the diffusion element includes at least a first diffusion region and at least a second diffusion region, and the at least one second diffusion region surrounds the at least one first diffusion region; Region, the haze of the at least one first diffusion region is greater than the haze of the at least one second diffusion region, wherein when the excitation beam is incident on the diffusion element, the at least one first diffusion region corresponds to the center of the excitation beam Where the at least one second diffusion region corresponds to the non-center of the excitation beam; a light valve is located on the transmission path of the illumination beam from the illumination system, and is adapted to transmit the illumination beam from the illumination system. The illumination beam is converted into an image beam; and a lens is positioned on the transmission path of the image beam. The projector according to item 1 of the scope of patent application, wherein the diffusion element has a light incident surface and a light outgoing surface opposite to each other, the at least one first diffusion region includes two first diffusion regions, and the at least one second diffusion region The region includes two second diffusion regions. The two first diffusion regions are respectively located on the light incident surface and the light emitting surface and are aligned with each other. The two second diffusion regions are respectively located on the light incident surface and the light emitting surface and are opposite each other. Alignment. The projector according to item 1 of the patent application scope, wherein an optical axis of the illumination beam passes through the at least one first diffusion region. The projector according to item 1 of the scope of patent application, wherein the haze of the diffusion element gradually decreases from the at least one first diffusion region to the at least one second diffusion region. The projector according to item 1 of the scope of patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and the first diffusion structures The arrangement density of is greater than the arrangement density of the second diffusion structures. The projector according to item 1 of the scope of patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and each of the first diffusion regions has The size of the structure is smaller than the size of each of the second diffusion structures. The projector according to item 1 of the scope of patent application, wherein the diffusion element is a fixed diffusion sheet. The projector according to item 1 of the patent application scope, wherein the diffusion element is a diffusion wheel and is adapted to rotate. An illumination system includes: a light source adapted to provide an excitation beam; and a diffusion element located on at least a portion of the transmission path of the excitation beam, wherein the diffusion element includes at least a first diffusion region and at least a second A diffusion region, the at least one second diffusion region surrounding the at least one first diffusion region, and a haze of the at least one first diffusion region being greater than a haze of the at least one second diffusion region, wherein when the excitation beam is incident on the diffusion In the device, the at least one first diffusion region corresponds to a center of the excitation beam, and the at least one second diffusion region corresponds to a non-center of the excitation beam. The lighting system according to item 9 of the scope of patent application, wherein the diffusion element has a light incident surface and a light outgoing surface opposite to each other, the at least one first diffusion region includes two first diffusion regions, and the at least one second diffusion region The region includes two second diffusion regions. The two first diffusion regions are respectively located on the light incident surface and the light emitting surface and are aligned with each other. The two second diffusion regions are respectively located on the light incident surface and the light emitting surface and are opposite each other. Alignment. The lighting system according to item 9 of the patent application scope, wherein an optical axis of the illumination beam provided by the lighting system passes through the at least one first diffusion region. The lighting system according to item 9 of the scope of patent application, wherein the haze of the diffusion element gradually decreases from the at least one first diffusion region to the at least one second diffusion region. The lighting system according to item 9 of the scope of patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and the first diffusion structures The arrangement density of is greater than the arrangement density of the second diffusion structures. The lighting system according to item 9 of the scope of patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and each of the first diffusion regions has The size of the structure is smaller than the size of each of the second diffusion structures. The lighting system according to item 9 of the application, wherein the diffusion element is a fixed diffusion sheet. The lighting system according to item 9 of the patent application scope, wherein the diffusion element is a diffusion wheel and is adapted to rotate. A diffusion element includes: at least one first diffusion region; and at least one second diffusion region surrounding the at least one first diffusion region, wherein the haze of the at least one first diffusion region is greater than that of the at least one second diffusion region. Haze, when an excitation beam is incident on the diffusion element, the at least one first diffusion region corresponds to a center of the excitation beam, and the at least one second diffusion region corresponds to a non-center of the excitation beam. The diffusing element according to item 17 of the scope of patent application, wherein the diffusing element has a light incident surface and a light emitting surface opposite to each other, the at least one first diffusion region includes two first diffusion regions, and the at least one second diffusion region The region includes two second diffusion regions. The two first diffusion regions are respectively located on the light incident surface and the light emitting surface and are aligned with each other. The two second diffusion regions are respectively located on the light incident surface and the light emitting surface and are opposite each other. Alignment. The diffusing element according to item 17 of the scope of patent application, wherein the haze of the diffusing element gradually decreases from the at least one first diffusion region to the at least one second diffusion region. The diffusion element according to item 17 of the scope of the patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and the first diffusion structures The arrangement density of is greater than the arrangement density of the second diffusion structures. The diffusing element according to item 17 of the scope of patent application, wherein the at least one first diffusion region has a plurality of first diffusion structures, the at least one second diffusion region has a plurality of second diffusion structures, and each of the first diffusion regions has The size of the structure is smaller than the size of each of the second diffusion structures. The diffusing element according to item 17 of the patent application scope, wherein the diffusing element is a fixed type diffusing sheet. The diffusing element according to item 17 of the scope of patent application, wherein the diffusing element is a diffusing wheel and is suitable for rotation. A projector includes: an illumination system adapted to provide an illumination beam, and comprising: a light source adapted to provide an excitation beam; and a diffusing element located on at least a part of the transmission path of the excitation beam, and Receiving at least a part of the excitation light beam to output at least a part of the illumination light beam, and having a plurality of diffusion structures and a light incident surface and a light emitting surface opposite to each other, wherein the light incident surface includes at least a first diffusion region and at least one A second diffusion region, the at least one second diffusion region of the light incident surface surrounding the at least one first diffusion region of the light incident surface, the light exit surface including at least one first diffusion region and at least one second diffusion region, the The at least one second diffusion region of the light emitting surface surrounds the at least one first diffusion region of the light emitting surface. The haze of the at least one first diffusion region is greater than the haze of the at least one second diffusion region. When reaching the diffusion element, the at least one first diffusion region on the light incident surface corresponds to the center of the excitation beam, and the at least one second diffusion region on the light incident surface corresponds to a non-center of the excitation beam; A light valve is located on a transmission path of the illumination light beam from the lighting system, and is adapted to convert the lighting beam from the lighting system into an image light beam; and a lens is located on the transmission path of the image light beam on. An illumination system includes: a light source adapted to provide an excitation beam; and a diffusing element located on at least part of the transmission path of the excitation beam, and having a plurality of diffusion structures, and a light incident surface and a light exit opposite to each other. Surface, wherein the light incident surface includes at least one first diffusion region and at least one second diffusion region, the at least one second diffusion region of the light incident surface surrounds the at least one first diffusion region of the light incident surface, and the light exits The surface includes at least one first diffusion region and at least one second diffusion region. The at least one second diffusion region of the light emitting surface surrounds the at least one first diffusion region of the light emitting surface. The haze of the at least one first diffusion region The haze is greater than the at least one second diffusion region. When the excitation beam is incident on the diffusion element, the at least one first diffusion region on the light incident surface corresponds to the center of the excitation beam. At least one second diffusion region corresponds to a non-center of the excitation beam. A diffusing element includes: a plurality of diffusing structures; a light incident surface; and a light emitting surface opposite to the light incident surface, wherein the light incident surface includes at least a first diffusion region and at least a second diffusion region. The at least one second diffusion region of the light surface surrounds the at least one first diffusion region of the light incident surface, and the light exit surface includes at least one first diffusion region and at least one second diffusion region. The at least one first diffusion region of the light exit surface Two diffusion regions surround the at least one first diffusion region of the light emitting surface. The haze of the at least one first diffusion region is greater than the haze of the at least one second diffusion region. When an excitation beam is incident on the diffusion element, the The at least one first diffusion region of the light incident surface corresponds to a center of the excitation beam, and the at least one second diffusion region of the light incident surface corresponds to a non-center of the excitation beam.